exten => _X.,1,NoOp( *-  -* )
exten => _X.,n,Set(PJSIP_SEND_SESSION_REFRESH()=invite)
exten => _X.,n,Dial(PJSIP/kamailio/sip:${EXTEN}@ip:5060,40,S(3602))
exten => _X.,n,Hangup()